/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.metron.stellar.dsl;

import java.util.function.Function;

public class DefaultVariableResolver implements VariableResolver{
  Function<String,Object> resolveFunc;
  Function<String,Boolean> existsFunc;

  public DefaultVariableResolver(Function<String,Object> resolveFunc, Function<String,Boolean> existsFunc){
    this.resolveFunc = resolveFunc;
    this.existsFunc = existsFunc;
  }
  @Override
  public Object resolve(String variable) {
    return resolveFunc.apply(variable);
  }

  @Override
  public boolean exists(String variable) {
    return existsFunc.apply(variable);
  }

  public static DefaultVariableResolver NULL_RESOLVER() {
    return new DefaultVariableResolver(x -> null, x -> false);
  }
}
